diff options
author | Loren Merritt <lorenm@u.washington.edu> | 2013-03-24 19:04:48 +0400 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2013-03-26 20:31:41 +0400 |
commit | 064146480b22d541c1c2e0c3e64c95c4370b777e (patch) | |
tree | b054305ced9d5b0d612433406be153ebd371dce0 /tests | |
parent | 1741fece7073f51efdd837a4f307ea2cdf3d1cfb (diff) |
tools: add tiny_ssim
Taken from:
http://lists.mplayerhq.hu/pipermail/mencoder-users/2006-August/003801.html
and
x264
See: [FFmpeg-devel] [PATCH] tools: add tiny_ssim
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Diffstat (limited to 'tests')
-rw-r--r-- | tests/Makefile | 2 | ||||
-rw-r--r-- | tests/tiny_ssim.c | 211 |
2 files changed, 212 insertions, 1 deletions
diff --git a/tests/Makefile b/tests/Makefile index 73ee2d9c5d..0f911e1b66 100644 --- a/tests/Makefile +++ b/tests/Makefile @@ -147,7 +147,7 @@ $(FATE_EXTERN): @echo "$@ requires external samples and SAMPLES not specified"; false endif -FATE_UTILS = base64 tiny_psnr +FATE_UTILS = base64 tiny_psnr tiny_ssim TOOL = ffmpeg diff --git a/tests/tiny_ssim.c b/tests/tiny_ssim.c new file mode 100644 index 0000000000..05eb98d54f --- /dev/null +++ b/tests/tiny_ssim.c @@ -0,0 +1,211 @@ +/* + * Copyright (c) 2003-2013 Loren Merritt + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110 USA + */ +/* + * tiny_ssim.c + * Computes the Structural Similarity Metric between two rawYV12 video files. + * original algorithm: + * Z. Wang, A. C. Bovik, H. R. Sheikh and E. P. Simoncelli, + * "Image quality assessment: From error visibility to structural similarity," + * IEEE Transactions on Image Processing, vol. 13, no. 4, pp. 600-612, Apr. 2004. + * + * To improve speed, this implementation uses the standard approximation of + * overlapped 8x8 block sums, rather than the original gaussian weights. + */ + +#include <inttypes.h> +#include <math.h> +#include <stdio.h> +#include <stdlib.h> + +#include "libavutil/avutil.h" + + +#define BIT_DEPTH 8 +#define PIXEL_MAX ((1 << BIT_DEPTH)-1) +typedef uint8_t pixel; + +/**************************************************************************** + * structural similarity metric + ****************************************************************************/ +static void ssim_4x4x2_core( const pixel *pix1, intptr_t stride1, + const pixel *pix2, intptr_t stride2, + int sums[2][4] ) +{ + for( int z = 0; z < 2; z++ ) + { + uint32_t s1 = 0, s2 = 0, ss = 0, s12 = 0; + for( int y = 0; y < 4; y++ ) + for( int x = 0; x < 4; x++ ) + { + int a = pix1[x+y*stride1]; + int b = pix2[x+y*stride2]; + s1 += a; + s2 += b; + ss += a*a; + ss += b*b; + s12 += a*b; + } + sums[z][0] = s1; + sums[z][1] = s2; + sums[z][2] = ss; + sums[z][3] = s12; + pix1 += 4; + pix2 += 4; + } +} + +static float ssim_end1( int s1, int s2, int ss, int s12 ) +{ +/* Maximum value for 10-bit is: ss*64 = (2^10-1)^2*16*4*64 = 4286582784, which will overflow in some cases. + * s1*s1, s2*s2, and s1*s2 also obtain this value for edge cases: ((2^10-1)*16*4)^2 = 4286582784. + * Maximum value for 9-bit is: ss*64 = (2^9-1)^2*16*4*64 = 1069551616, which will not overflow. */ +#if BIT_DEPTH > 9 +#define type float + static const float ssim_c1 = .01*.01*PIXEL_MAX*PIXEL_MAX*64; + static const float ssim_c2 = .03*.03*PIXEL_MAX*PIXEL_MAX*64*63; +#else +#define type int + static const int ssim_c1 = (int)(.01*.01*PIXEL_MAX*PIXEL_MAX*64 + .5); + static const int ssim_c2 = (int)(.03*.03*PIXEL_MAX*PIXEL_MAX*64*63 + .5); +#endif + type fs1 = s1; + type fs2 = s2; + type fss = ss; + type fs12 = s12; + type vars = fss*64 - fs1*fs1 - fs2*fs2; + type covar = fs12*64 - fs1*fs2; + return (float)(2*fs1*fs2 + ssim_c1) * (float)(2*covar + ssim_c2) + / ((float)(fs1*fs1 + fs2*fs2 + ssim_c1) * (float)(vars + ssim_c2)); +#undef type +} + +static float ssim_end4( int sum0[5][4], int sum1[5][4], int width ) +{ + float ssim = 0.0; + for( int i = 0; i < width; i++ ) + ssim += ssim_end1( sum0[i][0] + sum0[i+1][0] + sum1[i][0] + sum1[i+1][0], + sum0[i][1] + sum0[i+1][1] + sum1[i][1] + sum1[i+1][1], + sum0[i][2] + sum0[i+1][2] + sum1[i][2] + sum1[i+1][2], + sum0[i][3] + sum0[i+1][3] + sum1[i][3] + sum1[i+1][3] ); + return ssim; +} + +float ssim_plane( + pixel *pix1, intptr_t stride1, + pixel *pix2, intptr_t stride2, + int width, int height, void *buf, int *cnt ) +{ + int z = 0; + float ssim = 0.0; + int (*sum0)[4] = buf; + int (*sum1)[4] = sum0 + (width >> 2) + 3; + width >>= 2; + height >>= 2; + for( int y = 1; y < height; y++ ) + { + for( ; z <= y; z++ ) + { + FFSWAP( void*, sum0, sum1 ); + for( int x = 0; x < width; x+=2 ) + ssim_4x4x2_core( &pix1[4*(x+z*stride1)], stride1, &pix2[4*(x+z*stride2)], stride2, &sum0[x] ); + } + for( int x = 0; x < width-1; x += 4 ) + ssim += ssim_end4( sum0+x, sum1+x, FFMIN(4,width-x-1) ); + } +// *cnt = (height-1) * (width-1); + return ssim / ((height-1) * (width-1)); +} + + +uint64_t ssd_plane( const uint8_t *pix1, const uint8_t *pix2, int size ) +{ + uint64_t ssd = 0; + int i; + for( i=0; i<size; i++ ) + { + int d = pix1[i] - pix2[i]; + ssd += d*d; + } + return ssd; +} + +double ssd_to_psnr( uint64_t ssd, uint64_t denom ) +{ + return -10*log((double)ssd/(denom*255*255))/log(10); +} + +int main(int argc, char* argv[]) +{ + FILE *f[2]; + uint8_t *buf[2], *plane[2][3]; + int *temp; + uint64_t ssd[3] = {0,0,0}; + double ssim[3] = {0,0,0}; + int frame_size, w, h; + int frames, seek; + int i; + + if( argc<4 || 2 != sscanf(argv[3], "%dx%d", &w, &h) ) + { + printf("tiny_ssim <file1.yuv> <file2.yuv> <width>x<height> [<seek>]\n"); + return -1; + } + + f[0] = fopen(argv[1], "rb"); + f[1] = fopen(argv[2], "rb"); + sscanf(argv[3], "%dx%d", &w, &h); + frame_size = w*h*3/2; + for( i=0; i<2; i++ ) + { + buf[i] = malloc(frame_size); + plane[i][0] = buf[i]; + plane[i][1] = plane[i][0] + w*h; + plane[i][2] = plane[i][1] + w*h/4; + } + temp = malloc((2*w+12)*sizeof(*temp)); + seek = argc<5 ? 0 : atoi(argv[4]); + fseek(f[seek<0], seek < 0 ? -seek : seek, SEEK_SET); + + for( frames=0;; frames++ ) + { + if( fread(buf[0], frame_size, 1, f[0]) != 1) break; + if( fread(buf[1], frame_size, 1, f[1]) != 1) break; + for( i=0; i<3; i++ ) + { + ssd[i] += ssd_plane ( plane[0][i], plane[1][i], w*h>>2*!!i ); + ssim[i] += ssim_plane( plane[0][i], w>>!!i, + plane[1][i], w>>!!i, + w>>!!i, h>>!!i, temp, NULL ); + } + } + + if( !frames ) return 0; + + printf( "PSNR Y:%.3f U:%.3f V:%.3f All:%.3f\n", + ssd_to_psnr( ssd[0], (uint64_t)frames*w*h ), + ssd_to_psnr( ssd[1], (uint64_t)frames*w*h/4 ), + ssd_to_psnr( ssd[2], (uint64_t)frames*w*h/4 ), + ssd_to_psnr( ssd[0] + ssd[1] + ssd[2], (uint64_t)frames*w*h*3/2 ) ); + printf( "SSIM Y:%.5f U:%.5f V:%.5f All:%.5f\n", + ssim[0] / frames, + ssim[1] / frames, + ssim[2] / frames, + (ssim[0]*4 + ssim[1] + ssim[2]) / (frames*6) ); + + return 0; +} |